High biological value; easily absorbed in the body Purest form of whey protein available Low in fat and lactose Ideal post-workout Whey Protein Isolates are the purest and most expensive form of whey protein that exists. That's why they are the first ingredients you read on the Gold Standard 100% Whey label. By using Whey Protein Isolates as the primary protein source, Optimum Nutrition are able to pack 24 grams of the purest, muscle-building protein per serving, with a lot less of the fat, cholesterol, lactose, and other stuff that you can do without. High biological value; easily absorbed in the body Purest form of whey protein available Low in fat and lactose Ideal post-workout Whey Protein Isolates are the purest and most expensive form of whey protein that exists. That's why they are the first ingredients you read on the Gold Standard 100% Whey label. By using Whey Protein Isolates as the primary protein source, Optimum Nutrition are able to pack 24 grams of the purest, muscle-building protein per serving, with a lot less of the fat, cholesterol, lactose, and other stuff that you can do without.